Salvus | ChEESE - Centre of Excellence for Exascale Supercomputing in the area of the Solid Earth

Code name	Salvus
Developer(s)	Vaclav Hapla, Marta Pienkowska-Cote, Michael Afanasiev, and Lion Krischer For queries contact: Michael Afanasiev
Link	www.salvus.io
Short description	High-performance package for waveform modelling and inversion with applications ranging from laboratory ultrasound studies to planetary-scale seismology. Solves dynamic (visco-)acoustic and elastic wave propagation problems on fully unstructured hypercubic and simplicial meshes in 2 and 3 dimensions using a spectral-element approach.
Original code level	1
Current code level	1
Pilot(s) involved	PD1, PD9
Main results and References	All effort has been devoted to reduce/optimize the I/O issues, namely: Parallel reading from disk enabling Parallel input topological interpolation of mesh files
Performance results	A drastic reduction for the start-up time has been achieved, primarily through the work of Vaclav Hapla of ETH Zurich and Matthew Knepley of the University at Buffalo. This reduction was primarily due to the addition of parallel mesh reading and interpolation in the DMPlex module of PETSc.

Snapshot of the simulated magnitude of the seismic displacement at Earth’s surface from a hypothetical earthquake in the southwest of Iceland. Computations were carried out by the Salvus software package, and ran in parallel on 200 GPUs at the Swiss National Supercomputing Center.